This unit installs in the bottom rear cavity of the frame utilizing the lanyard hole for retention. Fits model M20, 21, 40 and 41. This product will only fit Generation 4 frames. Made of a high impact polymer, this insert is designed to keep out dust and debris as well as finish off the overall look of the frame. Allows for use with or without of the factory interchangeable backstraps.

DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.